Hwk4SolnGdDrtF09

Hwk4SolnGdDrtF09 - skewed. E) i) Here is the NPP for the...

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HA 2201 Hwk IV Solution Fall 2009 Homework IV Solution Question 1. A) =STDEV(A2:A57) yields s = 3.142652. =Average(A2:A57) yields the sample mean of = X 3.628571. =Median(A2:A57) yields X = 3. =Min(A2:A57) yields minimum of 0. =Quartile(A2:A57, 1) yields Q1 = 1.2. =Quartile(A2:A57, 3) yields Q3 = 4.6 =Max(A2:A57) yields maximum of 12. B) Since the sample mean is larger than the smaple median, we would guess the data to be right- skewed. But it is best to check with a histogram or NPP. C) Here we see that what the descriptive statistics implied is true: the data are right-skewed.
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HA 2201 Hwk IV Solution Fall 2009 D) Here once again we see that the data are right-skewed-not extremely so, but definitely right-
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Unformatted text preview: skewed. E) i) Here is the NPP for the square root of the data: This data looks fairly normal after the square root transformation. ii) i) Here is the NPP for the natural logarithm of the data: This data looks left skewed after the natural logarithm transformation. iii)Here is the NPP for the inverse transformation (1/Y): Here the data is EXTREMELY right-skewed. F) In this case I would analyze the data using the square root transformation, since this transformation yields data that appears to be (the most) normal....
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This note was uploaded on 04/28/2010 for the course HADM 2236 taught by Professor Spies during the Spring '09 term at Cornell.

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Hwk4SolnGdDrtF09 - skewed. E) i) Here is the NPP for the...

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